I have been playing music with room all day long. Unfortunately Roon gets slower and slower. Finding anything albums/artist/genres slows down significantly. After a reboot it is OK again.
I am running Roon on a MacMini with 2.6 GHz i7 16 GB RAM and 265 GB SSD.
Interesting, I too have Roon Core installed on a Mac Mini with the EXACT same specifications. All my music is on a NAS. I am using a Roon remote on my Macbook Pro to control playback, I have been running it all day too.